Process and system for sending headset control information from a mobile device to a wireless headset

ABSTRACT

A process for sending headset control information from a mobile device to a wireless headset utilizing the BLUETOOTH Hands-Free Profile audio channel is provided. The process includes the steps of encoding the headset control information as an analog signal; digitizing the analog signal; transmitting the digitized signal from the mobile device; receiving the digitized signal on the wireless headset; and decoding the digitized signal into the headset control information.

FIELD OF THE INVENTION

The present invention relates to communications between a mobile device and for example, a wireless headset, and to the transmission of instructions between them. In particular, the invention relates to sending headset control information from a mobile device to a wireless headset using BLUETOOTH Hands-free profile audio channels.

BACKGROUND

Generally speaking BLUETOOTH protocol includes the lossy compression of audio signals being sent from a mobile device to a wireless headset. Given this, it is almost impossible to send a binary encoded value from the mobile device to the headset reliably. For example, if the mobile device were to send audio gain information to the wireless headset over a compressed audio channel, the values recovered at the other end after the compression and decompression could be incorrect.

There does exist a means through the BLUETOOTH Hands-free protocol that commands can be sent from the device to the headset, but this is not always available for use depending on the target platform.

Therefore, a need exists for a process and system to send relative headset control information from a mobile device to a wireless headset using the BLUETOOTH Hands-free Profile audio channel.

SUMMARY

Accordingly, in one aspect, the present invention embraces a process for sending headset control information from a mobile device to a wireless headset utilizing the BLUETOOTH Hands-Free Profile audio channel.

In an exemplary embodiment, the process comprises the steps of: encoding the headset control information as an analog signal; digitizing the analog signal; transmitting the digitized signal from the mobile device; receiving the digitized signal on the wireless headset; and decoding the digitized signal into the headset control information.

In another exemplary embodiment of the invention, the headset control information is audio gain input information. The process further comprises the step of adjusting the gain of the headset based upon the decoded digitized signal.

In another exemplary embodiment, the step of encoding the gain adjustment includes the steps of: designating a sinusoidal wave at a first predetermined frequency based upon the gain to be increased by one step; and designating a sinusoidal wave at a second predetermined frequency based upon the gain to be decreased by one step; the first predetermined frequency being different from the second predetermined frequency.

In another exemplary embodiment, the step of encoding the gain adjustment includes the steps of: designating a sinusoidal wave at a first predetermined amplitude and frequency based upon the gain to be increased by one step; and designating a sinusoidal wave at a second predetermined amplitude and frequency based upon the gain to be decreased by one step. The first predetermined amplitude is different from the second predetermined amplitude. However the first frequency is the same as the second frequency.

In another exemplary embodiment, the step of encoding the gain adjustment is comprised of the steps of: encoding a segment of noise based upon the gain to be increased by one step; and encoding a segment of zeros based upon the gain to be decreased by one step.

In another exemplary embodiment, the noise is selected from pink noise and white noise.

In yet another exemplary embodiment, the analog signal is comprised of a first component and a second component. The first component indicates a magnitude of gain adjustment, and the second component indicates a direction of gain adjustment.

In another exemplary embodiment, the first component is a first sinusoidal wave having a predetermined frequency. The second component is a second sinusoidal wave having a predetermined frequency different from the frequency of the first sinusoidal wave. The step of transmitting the digitized analog signal is comprised of the step of: transmitting the first digitized sinusoidal wave and the second digitized sinusoidal wave simultaneously.

In another exemplary embodiment, the step of transmitting the digitized analog signal is comprised of the step of: transmitting the first component for a first portion of the transmittal; and transmitting the second component for a second portion of the transmittal.

In another exemplary embodiment, the process further comprises the step of: transmitting an audio pattern from the mobile device to the headset for alerting the headset that the process for headset control information is in use.

In another exemplary embodiment, the step of transmitting the digitized analog signal is done over a BLUETOOTH Hands-free Profile audio channel.

In yet another exemplary embodiment, the decoding step is accomplished using a Fast Fourier transform algorithm. In embodiments where the amplitude is used to designate gain adjustment, the decoding step includes finding the peak to peak values of the sinusoidal waves. In embodiments where the analog signal is either white or pink noise then the power spectral density will be analyzed.

In another exemplary embodiment, the gain adjustment is determined by a speech recognition system decision on the mobile device.

In another exemplary embodiment, the decoding step is accomplished by the steps of: determining characteristics of the received digitized analog signal; and matching the characteristics with pre-determined gain adjustment criteria.

In another aspect, the present invention embraces a system for hands-free adjustment of audio gain on a wireless headset from a mobile device.

In an exemplary embodiment, the system is comprised of: a central processing unit on the mobile device. The central processing unit is provided with means to generate analog signals, means to encode analog signals, and means to digitize analog signals. The system is also comprised of means for wireless transmittal of digitized analog signals on the mobile device. The central processing unit is communicatively linked to the means for wireless transmittal. Further, the system includes a central processing unit on the wireless headset. The central processing unit on the wireless headset is provided with means to decode digitized analog signals. The system further includes means to receive digitized analog signals on the wireless headset. The means to receive the digitized analog signals are communicatively linked to the central processing unit on the wireless headset. The system further includes means to adjust the gain on the wireless headset. The means to adjust the gain on the wireless headset is controlled by the central processing unit on the wireless headset. The central processing unit on the mobile device is configured to encode gain adjustment information on an analog signal and to digitize the analog signal. The central processing unit on the mobile device is further configured to transmit the digitized analog signal. The wireless headset is configured to receive the digitized analog signal. The central processing unit on the wireless headset is configured to apply the means to decode digitized analog signals to the received digitized analog signal, thereby decoding the gain adjustment information. The central processing unit on the wireless headset is further configured to adjust the gain on the wireless headset based upon the decoded digitized signal.

In another exemplary embodiment of the system, the analog signal is comprised of: a sinusoidal wave at a first predetermined frequency based upon the gain to be increased by one step; and a sinusoidal wave at a second predetermined frequency based upon the gain to be decreased by one step. The first predetermined frequency is different from the second predetermined frequency.

In another exemplary embodiment, the analog signal is comprised of: a sinusoidal wave at a first predetermined amplitude based upon the gain to be increased by one step; and a sinusoidal wave at a second predetermined amplitude based upon the gain to be decreased by one step. The first predetermined amplitude is different from the second predetermined amplitude.

In another exemplary embodiment of the system, the analog signal is comprised of: a segment of noise based upon the gain to be increased by one step, and a segment of zeros based upon the gain to be decreased by one step.

In another exemplary embodiment of the system, the noise is selected from pink noise and white noise.

In yet another embodiment of the system, the analog signal is comprised of a first component and a second component. The first component indicates a magnitude of gain adjustment, and the second component indicates a direction of gain adjustment.

In another exemplary embodiment of the system, the first component is a first sinusoidal wave having a predetermined frequency. The second component is a second sinusoidal wave having a predetermined frequency different from the frequency of the first sinusoidal wave. The central processing unit of the mobile device is configured to transmit the digitized first sinusoidal wave and the digitized second sinusoidal wave simultaneously.

In another exemplary embodiment of the system, the central processing unit of the mobile device is configured to transmit the digitized first component for a first portion of the transmittal and to transmit the digitized second component for a second portion of the transmittal.

In another exemplary embodiment, the central processing unit of the mobile device is configured to transmit an audio pattern to the headset to alert the headset that the system for gain adjustment is in use.

In another exemplary embodiment, the digitized analog signal is transmitted from the mobile device to the headset over a BLUETOOTH Hands-free Profile audio channel.

In another exemplary embodiment, the means to decode digitized analog signals is a Fast Fourier transform algorithm. The decoding may also entail a peak to peak detection of the audio signal, especially in embodiments where the amplitude is used as the gain adjustment property. In embodiments where the analog signal is either white or pink noise then the power spectral density will be analyzed.

In yet another exemplary embodiment of the system, the mobile device is provided with a speech recognition system, and the gain adjustment is determined by a decision of the speech recognition system.

In another exemplary embodiment of the system, the means to decode digitized analog signals is comprised of an algorithm. The algorithm is configured to determine characteristics of the digitized analog signal and to match the characteristics with pre-determined gain adjustment criteria. The algorithm may be a Fast Fourier transform algorithm.

The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically depicts in a flow chart the process according to an exemplary embodiment of the present invention.

FIG. 2 schematically depicts in a flow chart one exemplary embodiment for the encoding step from FIG. 1.

FIG. 3 schematically depicts in a flow chart another exemplary embodiment for the encoding step from FIG. 1.

FIG. 4 schematically depicts in a flow chart yet another exemplary embodiment for the encoding step from FIG. 1.

FIG. 5 schematically depicts the system of an exemplary embodiment of the invention.

DETAILED DESCRIPTION

The present invention embraces a process for sending headset control information from a mobile device to a wireless headset utilizing the BLUETOOTH Hands-Free Profile audio channel.

In an exemplary embodiment, referring to FIG. 1, the process comprises the steps of (31) encoding the headset control information as an analog signal; (32) digitizing the analog signal; (33) transmitting the digitized signal from the mobile device; (34) receiving the digitized signal on the wireless headset; and (35) decoding the digitized signal into the headset control information.

In another exemplary embodiment, the headset control information is audio gain input information, and the process further comprises the step of (36) adjusting the audio gain of the headset based upon the decoded digitized signal.

In another exemplary embodiment, the process further comprises the step of (38) transmitting an audio pattern from the mobile device to the headset for alerting the headset that the process for headset control information is in use. In the instant embodiment, the step (38) of transmitting an audio pattern would precede the step (31) of encoding the headset control information.

In another exemplary embodiment, the decoding step (35) may be accomplished by the steps of (39) determining characteristics of the received digitized analog signal; and (40) matching the characteristics with pre-determined gain adjustment criteria.

Alternatively, in another exemplary embodiment, the decoding step (35) may be accomplished by using a Fast Fourier transform algorithm (not shown). The decoding step may also entail a peak to peak detection of the audio signal, especially in embodiments where the amplitude is used as the gain adjustment property. In embodiments where the analog signal is either white or pink noise, the encoding step may include analyzing the power spectral density.

In another exemplary embodiment, the transmitting step (33) is done over a BLUETOOTH Hands-Free Profile audio channel.

In another exemplary embodiment, the gain adjustment is determined by a speech recognition system decision on the mobile device.

Referring now to FIGS. 2-4, the encoding step (31) may be accomplished by several methods.

In an exemplary embodiment, diagrammed in FIG. 2, the encoding step (31) is accomplished by the steps of (31 a) encoding the headset control information as an analog signal; (41) designating a sinusoidal wave at a first predetermined frequency based upon the gain to be increased by one step; and (42) designating a sinusoidal wave at a second predetermined frequency based upon the gain to be decreased by one step; the first predetermined frequency being different from the second predetermined frequency. Thus the headset will adjust the audio gain or other headset control based on which frequency of sinusoidal wave the headset receives.

In another exemplary embodiment, diagrammed in FIG. 3, the encoding step (31) is comprised of the steps of: (31 b) encoding the headset control information as an analog signal; (43) designating a sinusoidal wave at a first predetermined amplitude based upon the gain to be increased by one step; and (44) designating a sinusoidal wave at a second predetermined amplitude based upon the gain to be decreased by one step; the first predetermined amplitude being different from the second predetermined amplitude. Thus the headset will adjust the audio gain or other headset control based on what amplitude of sinusoidal wave the headset receives. In the present embodiment, the sinusoidal wave designating gain to be increased or decreased would be at the same frequency.

In another exemplary embodiment, diagrammed in FIG. 4, the encoding step (31) is comprised of the steps of: (31 c) encoding the headset control information as an analog signal; (45) encoding a segment of noise based upon the gain to be increased by one step; and (46) encoding a segment of zeros based upon the gain to be decreased by one step.

In the exemplary embodiment shown in FIG. 4, the noise is selected from pink noise and white noise.

In another exemplary embodiment, the analog signal is comprised of a first component and a second component, the first component indicating a magnitude of gain adjustment and the second component indicating a direction of gain adjustment.

In an exemplary embodiment, the first component is a first sinusoidal wave having a predetermined frequency, and the second component is a second sinusoidal wave having a predetermined frequency different from the frequency of the first sinusoidal wave. The transmitting step (33) is comprised of transmitting the first digitized sinusoidal wave and the second digitized sinusoidal wave simultaneously (not shown).

In another exemplary embodiment, transmitting step (33) is comprised of the steps of: transmitting the first component for a first portion of the transmittal, and transmitting the second component for a second portion of the transmittal (not shown).

In another aspect, the invention embraces a system for adjustment of audio gain on a wireless headset from a mobile device using the BLUETOOTH Hands-Free Profile audio channel.

Referring to FIG. 5, in an exemplary embodiment, the system (50) includes: a central processing unit (71) on the mobile device (70). The central processing unit (71) has means to generate analog signals, i.e. a signal generator (72), means to encode analog signals, i.e. a signal encoder (73), and means to digitize analog signals, i.e. a digitizer (74). As is known in the art, the mobile device (70) includes means for wireless transmittal (76) of digitized analog signals. The central processing unit (71) is communicatively linked to the means for wireless transmittal (76). Communicative links are designated in the figures as solid lines between objects. All these foregoing features and components of the mobile device (70) are well-known in the art. The wireless headset (60) is equipped with a central processing unit (62). The central processing unit (62) on the wireless headset (60) is provided with means to decode digitized analog signals, i.e. a decoder (66). The wireless headset (60) is also equipped with means to receive digitized analog signals (64). The means to receive the digitized analog signals (64) is communicatively linked to the central processing unit (62) on the wireless headset (60). The wireless headset (60) is further equipped with means to adjust the gain (68) on the wireless headset (60). The gain adjustment (68) is controlled by the central processing unit (62) on the wireless headset (60). The system (50) works with the central processing unit (71) on the mobile device (70) configured to encode gain adjustment information on an analog signal and configured to digitize the analog signal. The central processing unit (71) on the mobile device (70) is further configured to control the transmittal of the digitized analog signal with the transmitter (76). The wireless headset (60) is configured to receive the digitized analog signal. The central processing unit (62) on the wireless headset (60) is configured to apply the decoder (66) to decode the received digitized analog signals, thereby decoding the gain adjustment information. Finally, the central processing unit (62) on the wireless headset (60) is configured to adjust the gain on the wireless headset (60) using the gain adjustment (68) based upon the decoded digitized signal.

The analog signal to be encoded may take several forms. In an exemplary embodiment, the analog signal may be a sinusoidal wave at a first predetermined frequency based upon the gain to be increased by one step, and a sinusoidal wave at a second predetermined frequency based upon the gain to be decreased by one step. The first predetermined frequency is different from the second predetermined frequency.

In another exemplary embodiment the analog signal may be a sinusoidal wave at a first predetermined amplitude based upon the gain to be increased by one step, and a sinusoidal wave at a second predetermined amplitude based upon the gain to be decreased by one step. The first predetermined amplitude is different from the second predetermined amplitude.

In yet another exemplary embodiment the analog signal may be a segment of noise based upon the gain to be increased by one step, and a segment of zeros based upon the gain to be decreased by one step. The noise may be pink noise or white noise.

Alternatively, in another exemplary embodiment, the analog signal may be comprised of a first component and a second component. The first component indicates a magnitude of gain adjustment, and the second component indicates a direction of gain adjustment. So for example, in one exemplary embodiment, the first component is a first sinusoidal wave having a predetermined frequency. The second component is a second sinusoidal wave having a predetermined frequency different from the frequency of the first sinusoidal wave. The central processing unit (71) of the mobile device (70) is configured to transmit the digitized first sinusoidal wave and the digitized second sinusoidal wave simultaneously.

Alternatively, in another exemplary embodiment, the central processing unit (71) of the mobile device (70) is configured to transmit the digitized first component for a first portion of the transmittal and to transmit the digitized second component for a second portion of the transmittal.

In another exemplary embodiment of the system (50), the central processing unit (62) of the headset (60) is configured to transmit an acknowledgement to the mobile device (70) that the digitized analog signal for adjusting the gain was received. There are various ways known in the art to accomplish this. For example, the headset's (60) central processing unit (62) could be configured or programmed to instruct the means to receive digitized analog signals. The means to receive digitized analog signals (68) is also enabled to transmit. That is, the wireless headset (60) is enabled through the means (64) for wireless communication.

In another exemplary embodiment the central processing unit (71) of the mobile device (70) is configured to transmit an audio pattern to the headset (60) to alert the headset (60) that the system (50) for gain adjustment is in use. This will alert the central processing unit (62) of the headset (60) to expect gain adjustment information from the mobile device (70).

In accordance with an object of the invention, the system (50) uses the BLUETOOTH Hands-free Profile audio channel for headset control information transmittal. Thus the digitized analog signal is transmitted from the mobile device (70) to the headset (60) over a BLUETOOTH Hands-Free Profile audio channel.

In an exemplary embodiment, the decoder (66) employs a Fast Fourier transform algorithm to decode the digitized analog signals containing gain adjustment information, and if configured to do so, will determine the amplitude of the signal by doing a peak to peak measurement. In embodiments where the analog signal is either white or pink noise then the power spectral density will be analyzed.

In the alternative, the decoder (66) may employ various means to decode the digitized analog signals containing gain adjustment information. For example, the decoder (66) may employ an algorithm which is configured to determine characteristics of the digitized analog signals and to match the characteristics with pre-determined gain adjustment criteria.

In an exemplary embodiment, the mobile device (70) is provided with a speech recognition system (78) communicatively linked to the central processing unit (71). The gain adjustment may be determined by a decision of the speech recognition system (78).

To supplement the present disclosure, this application incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications:

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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation. 

1. A process for sending headset control information from a mobile device to a wireless headset utilizing the BLUETOOTH Hands-Free Profile audio channel, comprising: encoding the headset control information as an analog signal; digitizing the analog signal; transmitting the digitized signal from the mobile device; receiving the digitized signal on the wireless headset; and decoding the digitized signal into the headset control information.
 2. The process of claim 1, wherein: the headset control information is audio gain input information; and the process further comprises the step of adjusting the gain of the headset based upon the decoded digitized signal.
 3. The process of claim 2, wherein the step of encoding the gain adjustment includes the steps of: designating a sinusoidal wave at a first predetermined frequency based upon the gain to be increased by one step; and designating a sinusoidal wave at a second predetermined frequency based upon the gain to be decreased by one step; the first predetermined frequency being different from the second predetermined frequency.
 4. The process of claim 2, wherein the step of encoding the gain adjustment includes the steps of: designating a sinusoidal wave at a first predetermined amplitude and frequency based upon the gain to be increased by one step; and designating a sinusoidal wave at a second predetermined amplitude and frequency based upon the gain to be decreased by one step; the first predetermined amplitude being different from the second predetermined amplitude, and the first frequency being the same frequency as the second frequency.
 5. The process of claim 2, wherein the step of encoding the gain adjustment is comprised of the steps of: encoding a segment of noise based upon the gain to be increased by one step; and encoding a segment of zeros based upon the gain to be decreased by one step.
 6. The process of claim 2, wherein the analog signal is comprised of a first component and a second component, the first component indicating a magnitude of gain adjustment and the second component indicating a direction of gain adjustment.
 7. The process of claim 6, wherein the first component is a first sinusoidal wave having a predetermined frequency; the second component is a second sinusoidal wave having a predetermined frequency different from the frequency of the first sinusoidal wave; and wherein the step of transmitting the digitized analog signal is comprised of the step of: transmitting the first digitized sinusoidal wave and the second digitized sinusoidal wave simultaneously.
 8. The process of claim 6, wherein the step of transmitting the digitized analog signal is comprised of the step of: transmitting the first component for a first portion of the transmittal; and transmitting the second component for a second portion of the transmittal.
 9. The process of claim 1, further comprising the step of: transmitting an audio pattern from the mobile device to the headset for alerting the headset that the process for headset control information is in use.
 10. The process of claim 1, wherein the decoding step is accomplished using a Fast Fourier transform algorithm.
 11. The process of claim 2, wherein the decoding step is accomplished by the steps of: determining characteristics of the received digitized analog signal; and matching the characteristics with pre-determined gain adjustment criteria.
 12. A system for hands-free adjustment of audio gain on a wireless headset from a mobile device using the BLUETOOTH Hands-Free Profile audio channel, comprising: a central processing unit on the mobile device, the central processing unit having means to generate analog signals, means to encode analog signals, and means to digitize analog signals; means for wireless transmittal of digitized analog signals on the mobile device, the central processing unit being communicatively linked to the means for wireless transmittal; a central processing unit on the wireless headset; the central processing unit on the wireless headset being provided with means to decode digitized analog signals; means to receive digitized analog signals on the wireless headset, the means to receive the digitized analog signals being communicatively linked to the central processing unit on the wireless headset; means to adjust the gain on the wireless headset, the means to adjust the gain on the wireless headset being controlled by the central processing unit on the wireless headset; the central processing unit on the mobile device configured to encode gain adjustment information on an analog signal and to digitize the analog signal; the central processing unit on the mobile device further configured to transmit the digitized analog signal; the wireless headset configured to receive the digitized analog signal; the central processing unit on the wireless headset configured to apply the means to decode digitized analog signals to the received digitized analog signal, thereby decoding the gain adjustment information; and the central processing unit on the wireless headset further configured to adjust the gain on the wireless headset based upon the decoded digitized signal.
 13. The system of claim 12, wherein the analog signal is comprised of: a sinusoidal wave at a first predetermined frequency based upon the gain to be increased by one step; and a sinusoidal wave at a second predetermined frequency based upon the gain to be decreased by one step; the first predetermined frequency being different from the second predetermined frequency.
 14. The system of claim 12, wherein the analog signal is comprised of: a sinusoidal wave at a first predetermined amplitude and frequency based upon the gain to be increased by one step; and a sinusoidal wave at a second predetermined amplitude and frequency based upon the gain to be decreased by one step; the first predetermined amplitude being different from the second predetermined amplitude, and the first frequency and the second frequency being the same frequency.
 15. The system of claim 12, wherein the analog signal is comprised of: a segment of noise based upon the gain to be increased by one step; and a segment of zeros based upon the gain to be decreased by one step.
 16. The system of claim 12, wherein the analog signal is comprised of a first component and a second component, the first component indicating a magnitude of gain adjustment and the second component indicating a direction of gain adjustment.
 17. The system of claim 16, wherein the first component is a first sinusoidal wave having a predetermined frequency; the second component is a second sinusoidal wave having a predetermined frequency different from the frequency of the first sinusoidal wave; and wherein the central processing unit of the mobile device is configured to transmit the digitized first sinusoidal wave and the digitized second sinusoidal wave simultaneously.
 18. The system of claim 16, wherein the central processing unit of the mobile device is configured to transmit the digitized first component for a first portion of the transmittal and to transmit the digitized second component for a second portion of the transmittal.
 19. The system of claim 12, wherein the central processing unit of the mobile device is configured to transmit an audio pattern to the headset to alert the headset that the system for gain adjustment is in use.
 20. The system of claim 12, wherein the means to decode digitized analog signals is comprised of a Fast Fourier transform algorithm, the algorithm being configured to determine characteristics of the digitized analog signal and to match the characteristics with pre-determined gain adjustment criteria. 